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7th grade Midterm Study guide

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  • What is the basic unit of life?
    Organ
    Cell
    Tissue
  • Are bacteria unicellular organisms?
    Sometimes
    Yes
    No
  • Is a battery-operated toy tiger a living thing?
    No
    Only if it moves
    Yes
  • Which microorganisms can make their own food using sunlight?
    Bacteria
    Protozoa
    Algae
  • What type of microorganism includes yeasts and molds?
    Bacteria
    Protozoa
    Fungi
  • Light energy can travel through _____.
    solids only
    liquids only
    space
  • How do particles behave in gases?
    They are packed tightly
    They are far apart and move quickly
    They move slowly
  • What is the basic unit of life?
    Tissue
    Cell
    Organ
  • What do bacteria do in reproduction?
    Grow roots
    Form eggs
    Divide into two
  • Why do scientists stain cells?
    To clean them
    To see them better
    To preserve them
  • The control variable is the part of an experiment that _____.
    stays the same
    is measured
    changes
  • Which tool is used to measure temperature?
    Retort stand
    Beaker
    Thermometer
  • Thermal energy depends on how particles _____.
    change color
    shrink
    move
  • A battery-operated toy tiger is a _____.
    living animal
    nonliving thing
    plant
  • What is photosynthesis?
    Making oxygen
    Eating bacteria
    Process to make food in plants
  • What does MRS GREN help us remember?
    Types of experiments
    Life processes
    Lab equipment
  • How do bacteria reproduce?
    Sexual reproduction
    Photosynthesis
    Cell division
  • How many main types of microorganisms are there?
    3
    5
    4
  • All living things are made of _____.
    cells
    atoms
    proteins
  • What factor affects how particles move?
    Particle color
    Energy level
    Container shape
  • How does heat affect particle motion?
    Shrinks particles
    Increases movement
    Stops particles
  • What part of the cell is the "brain"?
    Membrane
    Cytoplasm
    Nucleus
  • What are viruses?
    Living cells
    Non-living microbes
    Energy particles
  • What is algae?
    A plant-like microorganism
    A virus
    A bacteria
  • What does a rough surface cause?
    Diffuse reflection
    Clear image
    Perfect reflection
  • Why do solids have a fixed shape?
    Particles move freely
    Particles are far apart
    Particles are tightly packed in a fixed pattern
  • What is the formula for kinetic energy?
    KE = m + v²
    KE = m × v
    KE = ½ × m × v²
  • What does the cell membrane do?
    Makes energy
    Controls what enters and leaves
    Gives cell color
  • What is the name of the process plants use to make food?
    Photosynthesis
    Respiration
    Combustion
  • Which of the following is not a characteristic of living microorganisms?
    Ability to reproduce
    Ability to grow
    Ability to remain completely stationary
  • Liquids have a fixed volume but not a fixed _____.
    temperature
    shape
    mass
  • Why are viruses considered special?
    They infect only plants
    They live in water only
    They are not technically alive
  • What does the nucleus do?
    Digests food
    Controls cell activities
    Moves the cell
  • What is the first step in the scientific method?
    Make a prediction
    Analyze data
    Ask a question
  • Can light energy travel through space?
    Only in a vacuum
    Yes
    No
  • What do we call tiny living organisms like bacteria and algae?
    Cells
    Molecules
    Microorganisms
  • What does the MRS GREN model help us understand?
    Bacterial growth
    Life processes of living things
    How microbes are cooked
  • Why is a microscope important?
    To see small things
    To mix chemicals
    To hear bacteria
  • Do liquids have a fixed shape?
    Yes
    Only when frozen
    No
  • What does Brownian motion show?
    Particles are stopped
    Particles get bigger
    Particles are always moving
  • Which cell part controls what goes in and out?
    Cell membrane
    Nucleus
    Cytoplasm
  • Why are control variables important?
    They change the results
    They make the experiment reliable
    They measure the outcome
  • What technique do scientists use to see microbial cells?
    Staining methods
    Magnifying glass
    Cooking methods
  • What is the control variable in an experiment?
    The result we measure
    The thing that changes
    The thing that stays the same
  • What does thermal energy relate to?
    Gravitational pull
    Particle motion
    Electric current
  • Brownian motion is evidence that _____.
    particles never move
    heat doesn't affect particles
    particles are always moving
  • What makes an experiment fair?
    Change all variables
    Use random data
    Only one variable is changed
  • What is one reason viruses are not fully living?
    They make their own food
    They breathe air
    They need a host to reproduce
  • What tool do we use to study microorganisms?
    Telescope
    Microscope
    Thermometer
  • What process do plants use to make food?
    Excretion
    Digestion
    Photosynthesis
  • Bacteria are _____ organisms.
    multicellular
    unicellular
    nonliving
  • How many bacteria can exist in one gram of soil?
    About 4 million
    Fewer than 1 million
    More than 40 million
  • What tool is used to view tiny organisms?
    Microscope
    Telescope
    Barometer
  • How are microorganisms helpful?
    They cause all diseases
    They can make food or medicine
    They grow roots
  • Are all living things made of cells?
    Only animals
    No
    Yes
  • Where are pollen grains made?
    Stigma
    Anther
    Ovary
  • Plants make their own food through _____.
    photosynthesis
    transpiration
    respiration
  • What is one example of an independent variable?
    Final result
    Things kept the same
    Type of light
  • The _____ is known as the brain of the cell.
    nucleus
    wall
    membrane
  • What is the role of the dependent variable?
    It stays the same
    It is measured
    It is changed
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